New Delhi, Sept. 12 -- The Delhi High Court on Thursday expressed concern over the Delhi government's failure to prevent treated water from mixing with contaminated wastewater before entering the Yamuna River, despite significant public expenditure on the issue. The court said this practice undermined the very purpose of sewage treatment plants (STPs) and common effluent treatment plants (CETPs).

A bench of justices Prathiba M Singh and Manmeet PS Arora directed the chief secretary to take comprehensive measures to tackle the pollution problem, including mapping Delhi's existing stormwater and sewage drainage systems. The court called for expert analysis to understand how these networks run parallel, connect to the main drain after treat...